Bug ID 609199: Debug TMM produces core when an MPTCP connection times out while a subflow is trying to join

Last Modified: Sep 13, 2023

Affected Product(s):
BIG-IP LTM(all modules)

Known Affected Versions:
11.5.0, 11.5.1, 11.5.2, 11.5.3, 11.5.4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9, 11.5.10, 11.6.0, 11.6.1, 11.6.2, 11.6.3, 11.6.3.1, 11.6.3.2, 12.0.0, 12.0.0 HF1, 12.1.0 HF1, 12.0.0 HF2, 12.1.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2, 12.1.0, 12.1.1

Fixed In:
13.0.0, 12.1.2, 11.6.3.3

Opened: Aug 04, 2016

Severity: 2-Critical

Symptoms

If an MPTCP connection times out while a subflow is still performing the three-way handshake, the TMM produces a core. This only affects the debug TMM, not the default one.

Impact

Traffic disrupted while tmm restarts.

Conditions

An MPTCP connection times out while a subflow is still performing the three-way handshake with MP_JOIN. This only affects the debug TMM.

Workaround

Disable MPTCP.

Fix Information

Remove unestablished joining subflows when freeing the MPTCP connection structure.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips